One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,7)(9,10)(11,13)(12,14)(15,16)(17,18,24,27,23,22,21,32)(19,28,20,30,29,25,31,26)(1,2,4,5)(3,7,8,6)(9,11,12,15)(10,13,14,16)(17,19)(18,25)(20,24)(21,31)(22,28)(23,29)(26,27)(30,32)(10,14)(13,16)(17,20)(18,26)(19,21)(22,30)(23,31)(24,29)(25,32)(27,28) involution — undirected(1,3,4,8)(2,6,5,7)(17,21,23,24)(18,27,22,32)(19,20,29,31)(25,30,28,26)(17,22,24,32,23,18,21,27)(19,25,20,26,29,28,31,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.